Frederico Valério (born Frederico Pires Valério on June 11, 1913, in Lisbon, Portugal, and died on May 29, 1982, in Lisbon) was a prominent Portuguese composer known for his significant contributions to the genre of fado, particularly the modern "Fado-Canção." His early interest in music led him to study at the Academia de Amadores de Música and later at the National Conservatory of Music, where he focused on piano.

Valério's professional career began at the age of 19 with the play "A Feira da Alegria," and he quickly established himself as a leading composer alongside contemporaries like Raúl Portela and Raúl Ferrão. Throughout the 1930s, he composed music for numerous theatrical productions in Lisbon, such as "Anima-te, Zé!" and "Milho Rei" (1935), "À Vara Larga" (1936), and "Chuva de Mulheres" (1937).

In the 1940s, Valério collaborated with the legendary fado singer Amália Rodrigues, composing some of her most famous songs, including "Ai Mouraria," "Fado do Ciúme," and "Que Deus me perdoe." His work in fado was both innovative and controversial, as it helped to shape the modern "Fado-Canção," a sub-genre initially rejected by purists but embraced by many renowned fadistas.

Valério also ventured into film music, composing soundtracks for films like "Capas Negras" and "Aqui, Portugal" in 1947. In 1948, he moved to the United States, where he achieved success in the American music market, notably reaching number 1 on the Hit Parade with "Don’t Say Goodbye" and composing for Broadway musicals such as "On with the Show" and "Hit the Trail" (1954).

Returning to Portugal later in his career, Valério continued to compose for artists like Simone de Oliveira and Helena Tavares. His contributions to music were recognized by the City Council of Lisbon, which named a street after him in the Caselas neighborhood. Frederico Valério remains an influential figure in the history of Portuguese music, celebrated for his pioneering work in fado and beyond.